package com.chy.gulimall.auth.controller;

import com.alibaba.fastjson.TypeReference;
import com.chy.common.constant.AuthServerConstant;
import com.chy.common.exception.BizCodeEnum;
import com.chy.common.utils.R;
import com.chy.common.utils.RandomUtil;
import com.chy.common.vo.MemberRespVo;
import com.chy.gulimall.auth.feign.MemberFeignService;
import com.chy.gulimall.auth.feign.ThirdPartyFeignService;
import com.chy.gulimall.auth.vo.UserLoginVo;
import com.chy.gulimall.auth.vo.UserRegistVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Controller
public class LoginController {

    @Autowired
    ThirdPartyFeignService thirdPartyFeignService;
    @Autowired
    StringRedisTemplate redisTemplate;
    @Autowired
    MemberFeignService memberFeignService;

    /**
     * 发送一个请求直接跳转到一个页面
     * SpringMVC viewcontroller: 将请求和页面映射过来。
     */
    @ResponseBody
    @GetMapping("/sms/sendcode")
    public R sendCode(@RequestParam("phone") String phone) {
        // todo 1. 接口防刷
        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone);
        if (!StringUtils.isEmpty(redisCode)){
            long l = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - l < 60000){
                // 60s内不能再发
                return R.error(BizCodeEnum.SMS_CODE_EXCEPTION.getCode(), BizCodeEnum.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        // 2. 验证码的再次校验。 redis。存key-phone  value-code   sms:code:17653545581 -> 456789
        String code = RandomUtil.getSixBitRandom();
        String substring = code + "_" + System.currentTimeMillis();
        // redis缓存验证码。防止同一个phone在60s内再次发生验证码
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + phone, substring, 10, TimeUnit.MINUTES);

        thirdPartyFeignService.sendCode(phone,code);
        return R.ok();
    }

    /**
     * todo 重定向携带数据，利用session原理。将数据放在session中。
     *     只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
     *
     * todo 1. 分布式下的session问题
     * RedirectAttributes 模拟重定向携带数据
     */
    @PostMapping("/regist")
    public String regist(@Valid UserRegistVo vo, BindingResult result, RedirectAttributes redirectAttributes) {
        if (result.hasErrors()) {
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
            // model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors",errors);
            // Request method 'POST' not supported
            // 用户注册 -> regist[post] ---> 转发/reg.html(路径映射默认都是get方式访问的)

            // 校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }
        // 1. 校验验证码
        String code = vo.getCode();

        String s = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
        if (!StringUtils.isEmpty(s)) {
            if (code.equals(s.split("_")[0])) {
                // 删除验证码; 令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getPhone());
                // 验证码通过 // 真正注册。调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    // 成功
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg",new TypeReference<String>() {}));
                    redirectAttributes.addFlashAttribute("errors",errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }

            } else {
                Map<String, String> errors = new HashMap<>();
                errors.put("code","验证码错误");
                redirectAttributes.addFlashAttribute("errors",errors);
                return "redirect:http://auth.gulimall.com/reg.html";
            }
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("code","验证码错误");
            redirectAttributes.addFlashAttribute("errors",errors);
            // 校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session) {
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (attribute == null) {
            // 没登录
            return "login";
        } else {
            return "redirect:http://gulimall.com";
        }
    }

    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session) {
        // 远程登录
        R login = memberFeignService.login(vo);
        if (login.getCode() == 0) {
            MemberRespVo data = login.getData("data", new TypeReference<MemberRespVo>() {});
            // 成功放到session中
            session.setAttribute(AuthServerConstant.LOGIN_USER, data);
            return "redirect:http://gulimall.com";
        } else {
            Map<String, String> errors = new HashMap<>();
            errors.put("msg",login.getData("msg",new TypeReference<String>(){}));
            redirectAttributes.addFlashAttribute("errors",errors);
            return "redirect:http://auth.gulimall.com/login.html";
        }
    }
}
